Document Detail


Transgenic suppression of cell death limits penetration success of the soybean rust fungus Phakopsora pachyrhizi into epidermal cells of barley.
MedLine Citation:
PMID:  19203273     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The basidiomycete Phakopsora pachyrhizi (P. pachyrhizi) causes Asian soybean rust, one of the most devastating plant diseases on soybean. When inoculated on the nonhost barley P. pachyrhizi caused only very small necrotic spots, typical for an incompatible interaction, which involves a hypersensitive cell death reaction. A microscopic inspection of the interaction of barley with P. pachyrhizi revealed that the fungus germinated on barley and formed functional appressoria on epidermal cells. The fungus attempted to directly penetrate through periclinal cell walls but often failed, arrested in plant cell wall appositions that stained positively for callose. Penetration resistance depends on intact ROR1(REQUIRED FOR mlo-SPECIFIED RESISTANCE 1) and ROR2 genes of barley. If the fungus succeeded in penetration, epidermal cell death took place. Dead epidermal cells did not generally restrict fungal development but allowed for mesophyll invasion, which was followed by mesophyll cell death and fungal arrest. Transient or stable over expression of the barley cell death suppressor BAX inhibitor-1 reduced both epidermal cell death and fungal penetration success. Data suggest that P. pachyrhizi provokes a programmed cell death facilitating fungal entry into epidermal cells of barley.
Authors:
Caroline Hoefle; Marco Loehrer; Ulrich Schaffrath; Markus Frank; Holger Schultheiss; Ralph Hückelhoven
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Phytopathology     Volume:  99     ISSN:  0031-949X     ISO Abbreviation:  Phytopathology     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-02-10     Completed Date:  2009-05-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9427222     Medline TA:  Phytopathology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  220-6     Citation Subset:  IM    
Affiliation:
Lehrstuhl für Phytopathologie, Technische Universität München, 85350 Freising-Weihenstephan, Germany.
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MeSH Terms
Descriptor/Qualifier:
Basidiomycota / physiology*
Cell Death
Genotype
Hordeum / genetics,  microbiology*
Host-Pathogen Interactions*
Plant Diseases / immunology*
Plant Epidermis / microbiology*
Plants, Genetically Modified / genetics,  microbiology
Soybeans / microbiology
Transformation, Genetic
Transgenes

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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